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【简答题】
已知：如图，AB是⊙O的直径，CD是⊙O的弦，且AB⊥CD，垂足为E． （1）求证：BC=BD； （2）若BC=15，AD=20，求AB和CD的长．
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【单选题】Which of the following statements about the religious beliefs of the Aleuts can be inferred from the passage?
A.
Prior to the Russian occupation they bad no religious beliefs.
B.
American traders and adventurers forced them to abandon all religious beliefs.
C.
At no time in their history have the Aleuts had an organized religion.
D.
The Russians forced Aleuts to become members of the Russian Orthodox Church.
【单选题】Which of the following statements about the religious beliefs of the Aleuts can be inferred from the passage?
A.
Prior to the Russian occupation they had no religious beliefs.
B.
American traders and adventurers forced them to abandon all religious beliefs.
C.
At no time in their history have the Aleuts had an organized religion.
D.
The Russians forced Aleuts to become members of the Russian Orthodox Church.
【单选题】根据下面短文内容，回答题。 The Workers' Role in Management It can be inferred from Paragraph 1 that managers __________. 查看材料
A.
were not qualified
B.
seldom obtain workers opinion
C.
dislike suggestion workers opinions
D.
never consulted the labor force
【单选题】移动模架预压目的不在于（ ）
A.
检验各构件受力后的安全性，检查系统在各种工况下构件应力与应变实测值与理论值的差异
B.
消除系统结构的非弹性变形
C.
检验支座的耐久性
D.
确定施工预拱度大小
【单选题】Which of the following about Nevelson's sculptures that the author believes can be inferred from the passage?
A.
They suggest religious and symbolic meanings.
B.
They do not have qualities characteristic of sculpture.
C.
They are mysterious and awe-inspiring, but not beautiful.
D.
They are uniquely American in style. and sensibility.
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